Prevent cursor from causing global reference leaks. | avoid stopping app in case of accessing empty db

and some string name changes.

 On branch jb422
 Changes to be committed:
	modified:   res/values/strings.xml
	modified:   src/com/android/settings/ApnSettings.java
	modified:   src/com/android/settings/LocationSettings.java

Change-Id: Icb350b62677bcf133414d5c1ea0fd34acf6c0508